Mergers from April 1, 1999 to Present

• On April 1, 2003 - the town of Kami
  Kami, Miyagi
  is a town located in Kami District, Miyagi, Japan.As of June 1, 2010, the town has an estimated population of 25,709 and a population density of 55.8 persons per km². The total area is 460.82 km²....
  
  (in Kami District
  Kami District, Miyagi
  is a district located in Miyagi Prefecture, Japan.As of 2010, the district has an estimated population of 33,240 and a population density of 58,3 persons per km². The total area is 570.05 km².-History:...
  
  ) was formed from a merger between three towns in the district: Miyazaki, Nakaniida, and Onoda.

• On April 1, 2005 - the towns of Naruse and Yamoto (in the former Monou District
  Monou District, Miyagi
  Monou was a district located in Miyagi, Japan.As of 2005, this district no longer exists.* On April 1, 2005 the towns of Yamoto and Naruse merged to form the city of Higashimatsushima....
  
  ) merged and created the city of Higashimatsushima
  Higashimatsushima, Miyagi
  is a city located in Miyagi Prefecture, Japan.It was created on April 1, 2005, when the towns of Naruse and Yamoto, both formally of Monou District, merged to form the new city....
  
  .

This merger, combined with the simultaneous Ishinomaki expansion, dissolved Monou District.

• On April 1, 2005 - all towns and villages in the Kurihara District
  Kurihara District, Miyagi
  Kurihara District was a district in Japan belonging to Mutsu Province or the Miyagi Prefecture. Established in the 8th century AD as Korehari or Koreharu District and abolished in 2005, the territory is identical to the city of Kurihara today....
  
   (dissolved by this action) merged and created the city of Kurihara
  Kurihara, Miyagi
  is a city located in Miyagi Prefecture, Japan. As of 2008, the city has an estimated population of 77,012 and a population density of 95.7 persons per km². The total area is 804.93 km². Previously a district consisting of nine towns and one village, on April 1, 2005, the towns and village...
  
  . One village and nine towns were involved in the merger. They were the towns of Ichihasama, Kannari, Kurikoma
  Kurikoma, Miyagi
  was a town in Kurihara District, Miyagi, Japan. Established in 1955 with the consolidation of six municipalities, it was abolished in a merger forming the larger Kurihara City in 2005.　The municipal area was 244.36 km² and the population was 13,736 in 2005....
  
  , Semine, Shiwahime, Takashimizu, Tsukidate, Uguisuzawa
  Uguisuzawa, Miyagi
  was a town located in Kurihara District, Miyagi, Japan.On April 1, 2005, Uguisuzawa was merged with the towns of Ichihasama, Kannari, Kurikoma, Semine, Shiwahime, Takashimizu, Tsukidate and Wakayanagi, and the village of Hanayama, all from Kurihara District, to form the new city of...
  
  , Wakayanagi
  Wakayanagi, Miyagi
  was a town located in Kurihara District, Miyagi, Japan.On April 1, 2005, Wakayanagi was merged with the towns of Ichihasama, Kannari, Kurikoma, Semine, Shiwahime, Takashimizu, Tsukidate and Uguisuzawa, and the village of Hanayama, all from Kurihara District, to form the new city of Kurihara.In...
  
  , and the village of Hanayama.

• On April 1, 2005 - all towns in the Tome District (dissolved by this action) merged with the town of Tsuyama from Motoyoshi District
  Motoyoshi District, Miyagi
  is a district located in Miyagi Prefecture, Japan.As of the Karakuwa merger but with 2010 population estimates, the district has an estimated population of 17,296 and a population density of 106 persons per km²...
  
   and created the city of Tome
  Tome, Miyagi
  is a city located in Miyagi Prefecture, Japan.Previously a district consisting of eight towns, on April 1, 2005, they, along with the town of Tsuyama formerly of Motoyoshi District, merged to form a new city. As of 2010, Tome city had an estimated population of 84,070 and a population density of...
  
  . Nine towns merged, which were Hasama, Ishikoshi, Minamikata, Nakada, Toyoma
  Toyoma, Miyagi
  was a town located in Tome District, Miyagi, Japan.On April 1, 2005 Toyoma was merged with the towns of Hasama, Ishikoshi, Minamikata, Nakada, Towa, Toyosato and Yoneyama, all from Tome District, and the town of Tsuyama, from Motoyoshi District, to form the new city of Tome.As of 2003, the town had...
  
  , Towa, Toyosato
  Toyosato, Miyagi
  was a town in the former Tome District, Miyagi, Japan. It is now a part of the city of Tome.As of November 2005, the town had an estimated population of 7,194 people. The total area is 32.85 km² was a town in the former Tome District, Miyagi, Japan. It is now a part of the city of Tome.As of...
  
  , Tsuyama, and Yoneyama

• On April 1, 2005 - five towns from the Monou District
  Monou District, Miyagi
  Monou was a district located in Miyagi, Japan.As of 2005, this district no longer exists.* On April 1, 2005 the towns of Yamoto and Naruse merged to form the city of Higashimatsushima....
  
   and Oshika town from the Oshika District
  Oshika District, Miyagi
  is a district located in Miyagi Prefecture, Japan.As of 2003, the district has an estimated population of 16,069 and a population density of 115.80 persons per km²...
  
   merged with the city of Ishinomaki
  Ishinomaki, Miyagi
  is a city located in Miyagi Prefecture, Japan.As of January 1, 2010, the city had an estimated population of 164,294 and a population density of 295.83 persons per km²...
  
   to create the new city of Ishinomaki
  Ishinomaki, Miyagi
  is a city located in Miyagi Prefecture, Japan.As of January 1, 2010, the city had an estimated population of 164,294 and a population density of 295.83 persons per km²...
  
  . The five towns from Monou District were Kahoku, Kanan, Kitakami, Monou and Ogatsu
  Ogatsu, Miyagi
  Ogatsu is a town located in Ishinomaki, Miyagi Prefecture, Japan.On April 1, 2005, Ishinomaki was merged with six towns, Kahoku, Kanan, Kitakami, Monou and Ogatsu, all from the former Monou District, and Oshika, from Oshika District, to more than quadruple its area and added nearly 60,000 people...
  
  .

This expansion, combined with the Higashimatsushima merger, dissolved Monou District.

• On October 1, 2005 - the town of Shizugawa
  Shizugawa, Miyagi
  was a town located in Motoyoshi District, Miyagi, Japan.On October 1, 2005, Shizugawa was merged with the town of Utatsu to form the new town of Minamisanriku, and no longer exists as an independent municipality....
  
   and the town of Utatsu
  Utatsu, Miyagi
  was a town located in Motoyoshi District, Miyagi, Japan.On October 1, 2005, Utatsu was merged with the town of Shizugawa to form the new town of Minamisanriku, and no longer exists as an independent municipality....
  
   from the Motoyoshi District
  Motoyoshi District, Miyagi
  is a district located in Miyagi Prefecture, Japan.As of the Karakuwa merger but with 2010 population estimates, the district has an estimated population of 17,296 and a population density of 106 persons per km²...
  
   merged to form the new town of Minamisanriku
  Minamisanriku, Miyagi
  , also spelled Minami Sanriku, is a resort town on a coastline of wooded islands and mountainous inlets. The town is in Motoyoshi District, Miyagi, Japan. It has an area of , and as of October 1, 2004 the population of the area was 19,170...
  
  .

• On January 1, 2006 - the towns of Kogota
  Kogota, Miyagi
  was a town located in Tōda District, Miyagi, Japan.On January 1, 2006 Kogota was merged with the town of Nangō, also from Tōda District, to form the new town of Misato and no longer exists as an independent municipality....
  
   and Nangō from Tōda District
  Toda District, Miyagi
  is a district located in Miyagi Prefecture, Japan.As of the Tajiri merger but with 2003 population estimates, the district had an estimated population of 45,374 and a population density of 289 persons per km²...
  
   merged into the new town of Misato
  Misato, Miyagi
  is a town located in Tōda District, Miyagi, Japan.The town was formed on January 1, 2006 by the merger of the towns of Kogota and Nangō. As of 2005, the town has an estimated population of 26,322 and a population density of 351 persons per km²...
  
  .

• On March 31, 2006 - the city of Kesennuma
  Kesennuma, Miyagi
  is a city located in the extreme northeast of Miyagi Prefecture, Japan, founded on June 1, 1953. It wraps around the western part of Kesennuma Bay, and also includes the island of Ōshima...
  
   merged with the town of Karakuwa
  Karakuwa, Miyagi
  was a town located in the extreme northeast of Miyagi Prefecture, bordering Kesennuma to the north-west and Rikuzentakata, part of Iwate Prefecture, to the north, and with Kesennuma Bay including Oshima island to the west, Hirota Bay to the north-east, and the Pacific Ocean to the south and east.On...
  
   from Motoyoshi District
  Motoyoshi District, Miyagi
  is a district located in Miyagi Prefecture, Japan.As of the Karakuwa merger but with 2010 population estimates, the district has an estimated population of 17,296 and a population density of 106 persons per km²...
  
   to create the new city of Kesennuma
  Kesennuma, Miyagi
  is a city located in the extreme northeast of Miyagi Prefecture, Japan, founded on June 1, 1953. It wraps around the western part of Kesennuma Bay, and also includes the island of Ōshima...
  
  .

• On March 31, 2006 - the city of Furukawa
  Furukawa, Miyagi
  was a city located in Miyagi Prefecture, Japan.In 2003, the city had an estimated population of 73,980 and a population density of 551.51 persons per km²...
  
   merged with the towns of Iwadeyama
  Iwadeyama, Miyagi
  was a town located in Tamatsukuri District, Miyagi, Japan.In 2003, the town had an estimated population of 13,476 and a population density of 95.78 persons per km²...
  
   and Naruko
  Naruko, Miyagi
  is a former town located in Tamatsukuri District, Miyagi, Japan.On March 31, 2006, Naruko was merged with the town of Iwadeyama, from Tamatsukuri District, the towns of Kashimadai, Matsuyama and Sanbongi, all from Shida District, the town of Tajiri, from Tōda District, and the city of Furukawa to...
  
   from Tamatsukuri District
  Tamatsukuri District, Miyagi
  Tamatsukuri was a district located in Miyagi, Japan.As of 2003, the district had an estimated population of 22,240 and a density of 47.50 persons per km²...
  
   and Kashimadai
  Kashimadai, Miyagi
  was a town located in Shida District, Miyagi, Japan.On March 31, 2006, Kashimadai was merged with the towns of Iwadeyama and Naruko, both from Tamatsukuri District, the towns of Matsuyama and Sanbongi, all from Shida District, the town of Tajiri, from Tōda District, and the city of Furukawa to...
  
  , Matsuyama
  Matsuyama, Miyagi
  was a town located in Shida District, Miyagi, Japan.On March 31, 2006, Matsuyama was merged with the towns of Iwadeyama and Naruko, both from Tamatsukuri District, the towns of Kashimadai and Sanbongi, all from Shida District, the town of Tajiri, from Tōda District, and the city of Furukawa to...
  
   and Sanbongi
  Sanbongi, Miyagi
  was a town located in Shida District, Miyagi, Japan.On March 31, 2006, Sanbongi was merged with the towns of Iwadeyama and Naruko, both from Tamatsukuri District, the towns of Kashimadai and Matsuyama, all from Shida District, the town of Tajiri, from Tōda District, and the city of Furukawa to...
  
   from Shida District
  Shida District, Miyagi
  Shida was a district located in Miyagi, Japan.As of 2003, the district had an estimated population of 29,126 and a density of 226.17 persons per km²...
  
   and Tajiri
  Tajiri, Miyagi
  was a town located in Tōda District, Miyagi, Japan.On March 31, 2006, Tajiri merged with the towns of Iwadeyama and Naruko, both from Tamatsukuri District, the towns of Kashimadai, Matsuyama and Sanbongi, all from Shida District, and the city of Furukawa to create the new city of Ōsaki...
  
   from Tōda District
  Toda District, Miyagi
  is a district located in Miyagi Prefecture, Japan.As of the Tajiri merger but with 2003 population estimates, the district had an estimated population of 45,374 and a population density of 289 persons per km²...
  
   to create the new city of Ōsaki
  Osaki, Miyagi
  is a city located in Miyagi Prefecture, Japan. Its area is 796.76 km², and its population was 135,129 as of November 1, 2010. The area was hard-hit during the 2011 Tōhoku earthquake.The city was formed on March 31, 2006, when several jurisdictions merged together....
  
  . Tamatsukuri District
  Tamatsukuri District, Miyagi
  Tamatsukuri was a district located in Miyagi, Japan.As of 2003, the district had an estimated population of 22,240 and a density of 47.50 persons per km²...
  
   and Shida District
  Shida District, Miyagi
  Shida was a district located in Miyagi, Japan.As of 2003, the district had an estimated population of 29,126 and a density of 226.17 persons per km²...
  
   were dissolved as a result of this merger.

• On September 1, 2009 - the town of Motoyoshi
  Motoyoshi, Miyagi
  was a town located in Motoyoshi District, Miyagi, Japan.In 2003, the town had an estimated population of 11,716 and a population density of 109.80 persons per km². The total area was 106.70 km². Motoyoshi was divided into four districts: Magome, Koizumi, Tsuya, and Ohya. Koizumi and Ohya were both...
  
   from Motoyoshi District
  Motoyoshi District, Miyagi
  is a district located in Miyagi Prefecture, Japan.As of the Karakuwa merger but with 2010 population estimates, the district has an estimated population of 17,296 and a population density of 106 persons per km²...
  
   merged into the city of Kesennuma
  Kesennuma, Miyagi
  is a city located in the extreme northeast of Miyagi Prefecture, Japan, founded on June 1, 1953. It wraps around the western part of Kesennuma Bay, and also includes the island of Ōshima...
  
  .

Planned/Future Mergers

• Both towns within Watari District are planning to merge and create a new city under the name of Watari. Watari District will dissolve if the city is created